﻿using System;
using System.Collections.Generic;
using System.Text;

namespace PmfWeb.Core.Utility
{
    ///<summary>
    /// 报表类
    ///</summary>
    public class Report
    {
        #region 导出DataTable的数据到Excel报表中
        /// <summary>
        /// 导出DataTable的数据到Excel报表中
        /// </summary>
        /// <param name="dtData">要导出的DataTable对象</param>
        public static void DataTableToExcel(System.Data.DataTable dtData)
        {
            if(null == dtData) return;
            System.Web.UI.WebControls.DataGrid dgExport = null;
            // 当前对话 
            System.Web.HttpContext curContext = System.Web.HttpContext.Current;
            // IO用于导出并返回excel文件 
            System.IO.StringWriter strWriter = null;
            System.Web.UI.HtmlTextWriter htmlWriter = null;

            if (0 < dtData.Rows.Count)
            {
                // 设置编码和附件格式 
                curContext.Response.ContentType = "application/vnd.ms-excel";
                curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
                curContext.Response.Charset = "";

                // 导出excel文件 
                strWriter = new System.IO.StringWriter();
                htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);

                //为了解决dgData中可能进行了分页的情况，需要重新定义一个无分页的DataGrid 
                dgExport = new System.Web.UI.WebControls.DataGrid();
                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();

                // 返回客户端 
                dgExport.RenderControl(htmlWriter);
                curContext.Response.Write(strWriter.ToString());
                curContext.Response.End();
            }
        }
        #endregion
    }
}